I'm not really sure what they've added since 6 months ago (I'm really bad with dates/time in general) but I can tell you they've added content with more on the way! I'm pretty sure the servers are quite lively, but I can't gurantee that as the only computer I've owned for the past 3 months~ can't run the game.

Before yesterday I hadn't played since they patched the zombie mode GP mining (over a year ago?). From what I can tell there are some new maps, but nothing major like the update that reworked recoil. Haven't had a problem finding people to play as far as servers go.